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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analytical function describing the behaviour of a thermocline storage tank: A requirement for annual simulations of solar thermal power plants
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Analytical function describing the behaviour of a thermocline storage tank: A requirement for annual simulations of solar thermal power plants

机译：分析功能描述温跃层储罐的性能：太阳能热电厂年度模拟的要求

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摘要

Thermocline tank behaviour during dynamic processes of charge/discharge and stand-by periods has been described in dimensionless form by means of the Logistic Cumulative Distribution Function(CDF). The Logistic-CDF parameter, S, has been correlated with both thermocline tank features and operation conditions(i.e. dimensionless velocity, υ*, and time, t*)with the help of a single-phase one-dimensional numerical model previously developed and validated. For the dynamic processes, it has been found that S becomes independent on υ* when υ*＞2500, but it always increases proportionally with(υ*t*)~ due to the progress of thermocline zone inside the tank. For adiabatic stand-by periods, in which υ*= 0, S parameter proportionally increases with(t*)~ whereas z_c* varies in order to keep constant the stored energy inside the tank. In terms of thermocline thickness it has been demonstrated that it is proportional to S parameter but its exact value strongly depends on the temperature accuracy that determines thermocline zone limits. This parameterised Logistic-CDF provides a general analytical equation for the outlet temperature of the storage liquid, which allows implementing thermocline storage systems in the annual performance simulations of solar thermal power plants.
机译：借助Logistic累积分布函数（CDF）以无因次形式描述了在充放电和待机期间动态过程中的温跃层槽行为。在先前开发和验证的单相一维数值模型的帮助下，已将Logistic-CDF参数S与温跃层水箱的特性和操作条件（即无量纲速度υ*和时间t *）相关联。对于动态过程，已经发现当υ*＞ 2500时，S变得独立于υ*，但由于储罐内部温跃层的发展，它总是与（υ* t *）〜成比例地增加。对于υ* = 0的绝热待机周期，S参数随（t *）〜成比例增加，而z_c *改变以保持罐内存储的能量恒定。就温跃层厚度而言，已证明它与S参数成正比，但其确切值在很大程度上取决于确定温跃层区域界限的温度精度。这个参数化的Logistic-CDF为存储液体的出口温度提供了一个通用的分析方程式，从而可以在太阳能热电厂的年度性能模拟中实施温床存储系统。

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